org.dromara.hutool.crypto.SpecUtil Maven / Gradle / Ivy
/*
* Copyright (c) 2013-2024 Hutool Team and hutool.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.dromara.hutool.crypto;
import org.dromara.hutool.core.util.RandomUtil;
import javax.crypto.spec.*;
import java.security.InvalidKeyException;
import java.security.spec.KeySpec;
/**
* 规范相关工具类，用于生成密钥规范、参数规范等快捷方法。
*
* - {@link KeySpec}: 密钥规范
* - {@link java.security.spec.AlgorithmParameterSpec}: 参数规范
*
*
* @author looly
* @since 6.0.0
*/
public class SpecUtil {
/**
* 根据算法创建{@link KeySpec}
*
* - DESede: {@link DESedeKeySpec}
* - DES : {@link DESedeKeySpec}
* - 其它 : {@link SecretKeySpec}
*
*
* @param algorithm 算法
* @param key 密钥
* @return {@link KeySpec}
*/
public static KeySpec createKeySpec(final String algorithm, byte[] key) {
try {
if (algorithm.startsWith("DESede")) {
if (null == key) {
key = RandomUtil.randomBytes(24);
}
// DESede兼容
return new DESedeKeySpec(key);
} else if (algorithm.startsWith("DES")) {
if (null == key) {
key = RandomUtil.randomBytes(8);
}
return new DESKeySpec(key);
}
} catch (final InvalidKeyException e) {
throw new CryptoException(e);
}
return new SecretKeySpec(key, algorithm);
}
/**
* 创建{@link PBEKeySpec}
* PBE算法没有密钥的概念，密钥在其它对称加密算法中是经过算法计算得出来的，PBE算法则是使用口令替代了密钥。
*
* @param password 口令
* @return {@link PBEKeySpec}
*/
public static PBEKeySpec createPBEKeySpec(char[] password) {
if (null == password) {
password = RandomUtil.randomStringLower(32).toCharArray();
}
return new PBEKeySpec(password);
}
/**
* 创建{@link PBEParameterSpec}
*
* @param salt 加盐值
* @param iterationCount 摘要次数
* @return {@link PBEParameterSpec}
*/
public static PBEParameterSpec createPBEParameterSpec(final byte[] salt, final int iterationCount) {
return new PBEParameterSpec(salt, iterationCount);
}
}